Multifocal ophthalmic lenses

a multi-focal, ophthalmic technology, applied in the field of ophthalmic lenses, can solve the problems of reduced depth perception, inability to accommodate, or bend the natural lens, and a substantial loss of depth perception

Inactive Publication Date: 2005-05-31
JOHNSON & JOHNSON VISION CARE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an individual ages, the eye is less able to accommodate, or bend the natural lens, to focus on objects that are relatively near to the observer.
Similarly, for persons who have had their natural lens removed and an intraocular lens inserted as a replacement, the ability to accommodate is totally absent.
The mono-vision system permits the wearer to distinguish both distance and near objects, but is disadvantageous in that a substantial loss in depth perception results.
However, multifocal contact lenses are problematic in that they expose the wearer's retina to two images at once, one in and one out of focus.
However, such lenses are problematic for distance vision.
As a result, the out of focus near images are inverted and interfere with the image of the distant object.

Method used

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Embodiment Construction

[0007]The invention provides methods for correcting presbyopia, lenses for such correction, and methods for producing the lenses of the invention. Each of the lenses of the invention provide both distance and near vision correction by providing both multifocal and monofocal regions within the same lens.

[0008]In one embodiment, the invention provides an ophthalmic lens for a lens wearer comprising, consisting essentially of, and consisting of an optic zone having a first region that is a multifocal region, a second region that is a monofocal region, and a third region of alternating distance optical power segments and near optical power segments wherein the near optical power segments are asymmetrical.

[0009]By “ophthalmic lens” is meant a contact, intraocular lens, or the like, or combinations thereof. Preferably, the lenses of the invention are contact lenses. By “multifocal region” is meant a region in which the power continuously increases from distance to near optical power or co...

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Abstract

The invention provides multifocal lenses for correction of presbyopia. Each of the lenses of the invention provide both distance and near vision correction by providing both a first multifocal region, a monofocal region, and a second multifocal region within the same lens.

Description

FIELD OF THE INVENTION[0001]The invention relates to ophthalmic lenses. In particular, the invention provides lenses that incorporate more than one optical power, or focal length, and that are useful in the correction of presbyopia.BACKGROUND OF THE INVENTION[0002]As an individual ages, the eye is less able to accommodate, or bend the natural lens, to focus on objects that are relatively near to the observer. This condition is known as presbyopia. Similarly, for persons who have had their natural lens removed and an intraocular lens inserted as a replacement, the ability to accommodate is totally absent.[0003]Among the methods used to correct presbyopia is the mono-vision lens system in which a person is fitted with, and wears, two contact lenses; one lens for distance vision and one lens for near vision. The mono-vision system permits the wearer to distinguish both distance and near objects, but is disadvantageous in that a substantial loss in depth perception results.[0004]Another...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02C7/04
CPCG02C7/028G02C7/045G02C7/044G02C7/042
Inventor ROFFMAN, JEFFREY H.JONES, LARRY G.HAYWOOD, JAMES W.
Owner JOHNSON & JOHNSON VISION CARE INC
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